# Population dose due to natural radiation in Hong Kong

## Abstract

In densely populated cities such as Hong Kong where people live and work in high-rise buildings that are all built with concrete, the indoor gamma dose rate and indoor radon concentration are not wide ranging. Indoor gamma dose rates (including cosmic rays) follow a normal distribution with an arithmetic mean of 0.22 {+-} 0.04 {micro}Gy h{sup {minus}1}, whereas indoor radon concentrations follow a log-normal distribution with geometric means of 48 {+-} 1 Bq m{sup {minus}3} and 90 {+-} 2 Bq m{sup {minus}3} for the two main categories of buildings: residential and non-residential. Since different occupations result in different occupancy in different categories of buildings, the annual total dose [indoor and outdoor radon effective dose + indoor and outdoor gamma absorbed dose (including cosmic ray)] to the population in Hong Kong was estimated based on the number of people for each occupation; the occupancy of each occupation; indoor radon concentration distribution and indoor gamma dose rate distribution for each category of buildings; outdoor radon concentration and gamma dose rate; and indoor and outdoor cosmic ray dose rates. The result shows that the annual doses for every occupation follow a log-normal distribution. This is expected since the total dose is dominated bymore »

- Authors:

- Publication Date:

- Research Org.:
- Univ. of Hong Kong (HK)

- OSTI Identifier:
- 20075784

- Resource Type:
- Journal Article

- Journal Name:
- Health Physics

- Additional Journal Information:
- Journal Volume: 78; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0017-9078

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 54 ENVIRONMENTAL SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; HONG KONG; INDOOR AIR CONTAMINATION; RADON; RADIATION DOSES; NATURAL RADIOACTIVITY; RADIATION MONITORING; BUILDINGS

### Citation Formats

```
Tso, M.Y.W., and Leung, J.K.C.
```*Population dose due to natural radiation in Hong Kong*. United States: N. p., 2000.
Web. doi:10.1097/00004032-200005000-00013.

```
Tso, M.Y.W., & Leung, J.K.C.
```*Population dose due to natural radiation in Hong Kong*. United States. doi:10.1097/00004032-200005000-00013.

```
Tso, M.Y.W., and Leung, J.K.C. Mon .
"Population dose due to natural radiation in Hong Kong". United States. doi:10.1097/00004032-200005000-00013.
```

```
@article{osti_20075784,
```

title = {Population dose due to natural radiation in Hong Kong},

author = {Tso, M.Y.W. and Leung, J.K.C.},

abstractNote = {In densely populated cities such as Hong Kong where people live and work in high-rise buildings that are all built with concrete, the indoor gamma dose rate and indoor radon concentration are not wide ranging. Indoor gamma dose rates (including cosmic rays) follow a normal distribution with an arithmetic mean of 0.22 {+-} 0.04 {micro}Gy h{sup {minus}1}, whereas indoor radon concentrations follow a log-normal distribution with geometric means of 48 {+-} 1 Bq m{sup {minus}3} and 90 {+-} 2 Bq m{sup {minus}3} for the two main categories of buildings: residential and non-residential. Since different occupations result in different occupancy in different categories of buildings, the annual total dose [indoor and outdoor radon effective dose + indoor and outdoor gamma absorbed dose (including cosmic ray)] to the population in Hong Kong was estimated based on the number of people for each occupation; the occupancy of each occupation; indoor radon concentration distribution and indoor gamma dose rate distribution for each category of buildings; outdoor radon concentration and gamma dose rate; and indoor and outdoor cosmic ray dose rates. The result shows that the annual doses for every occupation follow a log-normal distribution. This is expected since the total dose is dominated by radon effective dose, which has a log-normal distribution. The annual dose to the population of Hong Kong is characterized by a log-normal distribution with a geometric mean of 2.4 mSv and a geometric standard deviation of 1.3 mSv.},

doi = {10.1097/00004032-200005000-00013},

journal = {Health Physics},

issn = {0017-9078},

number = 5,

volume = 78,

place = {United States},

year = {2000},

month = {5}

}